I think there will be more than one person like your friend.. and yes a D800 is nice and all.. but a 1.2 crop camera would be half the price of a D800/D800E.
I am all for getting the gear to ft the function. If I absolutely needed a 24 1.4 and a FF camera I would get it. Many of my friends have indeed upgraded to a D600. especially those that like to take portraits and fashion. They already had the 70-200 and that was their main lens. so its a no brainier upgrade. (just curios why a 24 F1.4 is so essential for your friend, I am guessing weddings?)
For the rest of us guys who struggled with the minister of finance to get the D7000 (not to suggest it was not fun encounters) a D800 would be impossible. But, a D800 like DX camera would be a reachable compromise and if it had a 1.2 crop that would increase the desire even more.. well worth a few more dishes done, lawn mowing and rubbish taking, maybe even a soppy movie or 2 :-( . (Note you still need to do the soppy stuff even after you get the D400 ! this is for the next piece of gear. say a 24 1.4 ! )